Factors of Extinction Why are some species more or less prone to extinction?

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Presentation transcript:

Factors of Extinction Why are some species more or less prone to extinction?

Specialization Source: watching.php Source: Source: Overspecialization of feeding Over specialization of habitat

Reproductive Rate Source: Source: r versus K strategists

Prey/Man Source: Source: Source: Man preying on species Hunting Trade Species preying on man or livestock

Trophic level Higher up in the food chains are more susceptible Source:

Interspecific Competition Nesting sites Food Breeding Habitat Source: s/POD/a/axis-deer ga.jpg

Behavior Migratory Patterns Fixed Flexible Source: Source: 830FB1D A67B5D6)~red+crabs+migration.JPG/$file/red+cra bs+migration.JPG

Distribution The more limited the more prone Source: OD/g/grassland-kangaroos ga.jpg Source: ography/Images/POD/p/polar-bear-cubs ga.jpg

Overall Numbers The lower the numbers the more prone Source: typus.jpg Source: s/Photography/Images/POD/b/baby-gorilla-gabon ga.jpg

Strategies for Success Generalists over specialists Diversity Of ecosystems Complexity of food webs Inertia/Constancy Resilience Source:

Categories and Criteria from: The IUCN Red List of Threatened Species

Conservation Status Extinct (EX) – there is no reasonable doubt that the last individual has died Extinct in the Wild (EW) – Known only to survive in cultivation, in captivity, or as a naturalized population well outside the past range

Threatened Critically Endangered (CR) – Facing an extremely high risk of extinction in the wild Endangered (EN) – Facing a very high risk of extinction in the wild Vulnerable (VU) – Facing a high risk of extinction in the wild

Criteria for CR, EN and VU Reduction of population size by W% over 10 years or 3 generations Size of geographic range Population size of mature individuals less than X with continued decline of Y% over 10 years or 3 generations Population size of mature individuals less than Z Quantitative analysis showing the probability of extinction in the wild

Conservation Status Near Threatened (NT) – Close the qualifying for a threatened category in the near future Least Concern (LC) – Widespread abundant taxa are included in this category

Conservation Status Data Deficient (DD) - there is inadequate information to make an assessment of the risk of extinction Not Evaluated (NE) – has not been evaluated against criterion